Because our brains have a way of creating a synthesized happiness when we don't get what we want, it's often hard for us to make a "wrong" decision. As a result, you're better off just deciding and moving forward.

In this oldie-but-goodie video from Ze Frank, discussing Dan Gilbert's very interesting and entertaining book Stumbling on Happiness, we get an explanation of how our brains can't tell the difference between synthesized happiness and actual happiness. If we make a "wrong" decision, we find a way to make ourselves feel like it was ultimately in our best interest—and this, to the brain, feels just as good as real happiness. We're also terrible at predicting how we're going to feel in the future, so when we spend time deliberating over a relatively simple decision it is generally a wasted effort. While it's certainly good to wait for the optimal time to make a decision, when it comes to the smaller choices in our lives its best to just choose something and keep moving forward. Ultimately, we'll be happy with either choice so long as we don't have to think about it anymore.